The Following Figure Displays Results from a Systematic Review and Meta‐analysis

Multiple Choice

The following figure displays results from a systematic review and meta‐analysis of the effects of sun exposure on mental health.The RRs represent the association between
Higher sun exposure and good mental health.Studies 1, 2 and 5 are cohort studies, 3 and 4
Are case‐control studies.They are arranged in order of year of publication, earliest first. Which of the following statements are true? (Select all that apply) The summary
Result of the meta‐analysis:

A) Tells us for certain that sunlight is good for mental health
B) Is meaningless because of the extreme heterogeneity of the RRs
C) Is of practical public health importance
D) Is helpful in assessing whether the relation might be causal
E) Is statistically significant